Variable-speed transmission



Jan. 27, 1925..

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M. S. LOGANl VARIABLE SPEED TRANSMISSION Filed Jan. 28, 1922 2 Sheets-Sheet 1 Jan. 27, 1925.

M. S. LOGAN VARIABLE SPEED TRANSMISSION 2 Sheets-Sheef 2 Filed Jan. 28J 1922 z w MwLf Y rl Patented Jan. 27, 1925.

UNITED STATES frcs.

MAURICE SAMUEL LOGAN, OF LOREBURN, SASKATCHEWAN, CANADA.

VARIABLE-SPEED TRANSMISSION.

Application filed January 28, 1922.

To all lwhom t may concern.'

Be it known that I, MAURICE SAMUEL LOGAN, a citizen of Canada, residing at Loreburn, in the Province of Saskatchewan and Dominion of Canada, have invented a new and useful Variable-Speed Transmission, of which the following is a specification.

My invention relates to power transmissions for Automobiles, tractors, trucks, and any other mechanism Where variable speed isdesired. The objects of my invention are, first, gradual change of speed; second, change of speed without change of gear;

third, change of speed by wholly mechanical means; fourth, range of speed from no speed to high speed; fifth, positive gear drive; sixth, central drive at all speeds; seventh, simplicity, strength, and durability.

I attain these objects by the mechanism illustrated in the accompanying drawing, in which Figure 1 represents a fly-wheel with face removed, showing the variable speed transmission as encased therein. Fig. 2 is a cross section through any one of the three dotted lines in Fig. l. Fig. 3 shows the reverse side of the eccentric. Fig. 4 1s a cross section through the driven shaft and central V gear, and showing the means for shifting the eccentric. Fig. 5 is an end view of the driven shaft and central gear with arm and nonfriction roller. Figs. 6 and 7 are cross sections through the dotted lines 14C and 15, in Fig. 3, respectively. Fig. 8 is a face view of the nonfriction roller and retainer, a side view of which is shown in Fig. 5. Fig. 9 is same as Fig. 1 except the eccentric is in central position. Fig. 10 is a cross section through the dotted line in Fig. 9, and with face plate 1 in place.

Similar numerals refer to similar parts throughout the several views.

which is removed in Fig. 1. 2 is a section of the other face plate. The extension of gear 9 meshes with the eccentric ring, and the clearance in the main axle is for the eccentric. Face plate 1 is attached rigidly 5o to the end of the crank shaftl 28 (see Fig. 1.0) and carries a bearing in which the end of the driven shaft 8 rests. The wings 3, 3, 3 (Figs. 1 and 2) are cast integral with the rim of the ily-wheel, in two sections as indicated by the division line 1l (Fig.

j wheel.

justment. In Fig. 2, 1 is a section of the face plate Serial No. 532,396.

These two rim castings and the two face plates are clamped together by bolts passing through holes 5 (Fig. 1).

The fly-wheel rotates in the direction indicated by the arrow and carries gears 6, 6, 6 and 9,` 9, 9 (Figs. land 2) around with it. Said gears 6, 6, 6 mesh with the central gear 7 (Figs. 1, 'll and 5) which is mounted rigidly on the driven shaft 8. Gears 9, 9, 9 (Figs. 1 and'2) are mounted on the swing- 65 ing frames 10, 10, 10 which hold them in mesh with gears 6, 6, 6, while allowing them to be held in mesh with eccentric ring 11 by arms 12, 12, 12 which are attached to separate eccentric rings. To

Said gears 6 and 9 rotate reversely, thus causing gear 'r' and eccentric 13 to pull against each other in their combined hold against the pull lof the ily-wheel, on the principle of a differential or evener.

When eccentric 13 is on centre, the eccentric ring 11 turns freely and gives no holding power to the eccentric. Hence gears 6 merely travel around gear 7 without. turning it. This is the no speed adjustment. When said eccentric is olf centre, it exerts an offcentre pull against the rotation of the fly- This off-centre pull is from both sides balancing across the'centre of the eccentric; for since the eccentric ring 11 is 1"@ free to turn, any pressure on one side will balance itself across the centre to the opposite side. The centre of the eccentric thus receives the resultant pressure from both sides. Then the centre of the eccentric is in so y line with the pitch circle of the central gear .combined hold against the rotation of the fly-wheel, so that the fly-wheel cannot turn D5 without carrying the whole mechanism around with it. This is the high speed ad- Between these extreme adjustments, every intermediate speed may be obtained.

lffhen the whole mechanism rotates with the fly-wheel as a unit there is no gear travel, and hence no wear. The greatest gear travel is when running idle, involving only the wear of idle running. The wear is thus reduced to a minimum at all speeds. The fly-wheel is oil-tight, and oil contained in it is carried around so as to give the most perfect lubrication.

Pulling leverage varies with the speed of 11o Cir vshaftcr'osswise' tothe'fslot. Y `Rack 16 (Figs.

lmand 1)slides inagroove'in' theY side; of said shaft, andis keyed rigidly to the' shifting collar 2O by the v`keys' 21,21. Said' shifting lcollar'"slides along the shaft vand is shiftedby a lever (notshown) 'in the usual manner. Rack `16-turns the gear '19 which iii-"turn shifts the racks 17 and -18 ingopposite directions. The ends of rackl-fitinto the iecesses'22, 22 ig. 3)inthe side of the eccentric, softhat shifting ,said 4rack shifts. the eccentric also. `Rackr18 shifts a counteir'weight* (not f shown) in a similar manner f'but in the "oppositefdirection vThe sole purpose of the counter weight is to preserve thefly-wheel balance. Instead of the shifting fcounterweight, a mean -counterweight maybe l'attached lrigidly to the driven shaft,I asshowni at 27 in Fig.` 10, or the entii'e gear systemI lnia-ybel duplicated and the two systems operated vto counter-balance each other.

lThe 23 (I"`igs'. 1,14 and prevents the leccentric f fromgrotatingf on shaft 8. The

`dottedline'inifFigf5 Arepresents the edge of the tra-'ck' 24 (Fig.- 3) when inwerking position. HfT-he-retainer 25 (Figs. 5 and 8) holds the non'f-rictioirroller in position without lint'erferring''with)its rolling. AObserve that the pressure side of thel eccentric presses against said nonfriction roller and thatthe sliaft, "and swinging gears mounted on lfpressure is sidewise'to the lineof shift.

" This makesthe eccentric 'shift' easily.

' In the foregoing specification, :the gear casing carrying-gears 6 and 9 is,regarded`-as `the drive 'eleiiient-,- andthe "shaft 8z carrying gear 7 and-eccentric 13 asthe driven element. This order may" be reversed, iniwliich case, the gearcasing cannot vbe utilized as the flyf wheel, and av separate fly-wheelattached Vto thedrive' element will be required.

Any Areverse mechanism uncommon-use jmay' be used with this transmission, giving allspeeds forwarder reverse.

ce shaft carrying a central gear mountedjrigidly thereon and an ecce'iitriemounted yadjustably thereon, said' central-gear and said eccentric being connected diifereiitially to said drive' I claim: Y Y l-1.'In a variable speed transmission,`y the vcombination of a drive element consisting of Y 'abrot'atable gear support carrying differential gearing, and a driven element, lconcentric withA said drive element,consisting ofl` a element' through said differential gearing,

and means for shifting said eccentric, substantially as shown and described.

2.`In a variable speed transmission, the combination of a drive element and a driven element concentric with each other, one conthrough said differential gearing, and means for shifting said eccentric, substantially as shown' and described.

3.TIn ,a variable speed transmission, the combination of u a central gear mounted rigidly on a central shaft, aneccentrie,icai' rying a cog-bearing eccentric ring, and

mounted adjustably on said shaft, differential gearing, carried on a rotatable gear sup= port` and operatively meshing with said central-'Crear and said eccentricrinr `and means "forfshifting said eccentric, substantially as shown vand described.

`4511i al VVariable speed transmission, the"l combination of a central gear mounted 4rigidly on a central shaft, an eccentric, carrying a cog-bearing eccentric ring, `and finounted adjustably on said shaft, a gear Icasing mounted rotatably on said 'shaft and carrying a series of differential gearing operatively meshing with said central gear and` with said eccentric ring, means for preventing said eccentric fronrrotating on said shaft, land means for shifting said eccentric, substantially as shown and ldescribed.

5511il a variable speed traiisinissioingthe combination ofv a rotatable gear support rarrying planetary gears which mesh with a-ceiitral gear mounted rigidly on a central Aswinging frames which are mounted eentrally with' said planetary gears and which hold said swinging-gears in mesh with said planetaryggears, an eccentric carrying a cog- -bearing eccentric; ring Y and; mounted adjustablyy on said shaft, separate eccentric rings mounted on said eccentric carrying arms which hold saidswinging gears in mesh with said'cog-gearing eccentric ring, and means for shifting said eccentric, substantially as shown and described. i

6. In a variable speed transmission, the

combination of a? drive element and a driven element concentric with each othei, one ele- -mentcairying a fixed central gear 7 and adjustable eccentric 13, said eccentric 13 being provided with a' cog-bearing eccentric ring 11 and arm-bearing eccentric rings 12; the

.otlierelement carrying planetary gears 6 anddiifereiitial piiiioiis 9 mounted on swin fing'frames 10, said planetary gears G nies iing with said central gear 7 and saidA diil'ereiit-ial piiiions 9 held in mesh with said planetary gear 6 by said swinging frames l0 and llO CII

held in mesh with said cog-bearing eccentric ring 11 by said arm-bearing eccentric rings 12, and means for shitting said eccentric 13.

7. ln a variable speed transmission, the combination of a drive element and a driven element concentric with each other, one element carrying a fixed central gear 7 and an adjustable eccentric gear 11, the other element carrying means for applying the power diiierentially between said central gear 7 and said eccentric gear l1, said means consisting of planetary gears 6 meshing With said central gear 7 and power conveying swinging frames 10 mounted centrally with said planetary gears 6 and bearing on their swinging ends differential pinions 9 meshing with said planetary gears 6 and also held in mesh with said eccentric gear 1l by centreconnecting links 12; and means for adjusting the eccentric-ity of said eccentric gear 1l.

8. In a variable speed transmission, a

counter-balancing combination of unit systems, each unit system consisting of a drive element and a driven element concentric with each other, one element carrying a lined central gear 7 and an adjustable eccentric gear 11 operatively connected by differential gearing carried by the other element, said dil'l'erential gearing consisting of planetary gears 6 meshing with said central gear 7 and swinging frames l0 mounted centrally with said planetary gears 6` and bearing on their swinging ends pinions 9 meshing with said planetary gears 6 and also held in mesh with said eccentric gear l1 by centre-connecting links l2; and ymeans for adjusting the eccentricity of said eccentric gear ll.

MAURICE SAMUEL LOGAN.

Witnesses:

R. G. BALDWIN. J. P. BALDWIN. 

